package com.example.rice.controller;


import com.example.rice.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;


/**
 * 文件上传下载
 * 控制器
 */

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${rice.path}")
    private  String basePath;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){


        //获取原始文件名称
        String originalFilename = file.getOriginalFilename();
        //获取原文件的扩展名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID生成随机的字符作为文件的新名称
        String fileName = UUID.randomUUID().toString()+suffix;

        File  dir = new File(basePath);
        //判断目录是否存在
        if(!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(basePath+name);

            //输出流，写入到浏览器中
            ServletOutputStream outputStream = response.getOutputStream();

            //文件类型是图片
            response.setContentType("image/jpeg");

            //判断是否写入完
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        }
    }
}
